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Finding the Fourth Proportional to 91,223.70, 136,543.95 and 64,979.70

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Solution

The fourth proportional to 91,223.70, 136,543.95 and 64,979.70 is: 97,261.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,223.70 : 136,543.95 = 64,979.70 : x
  2. Step 2: Convert to fraction form
    91,223.70/136,543.95 = 64,979.70/x
  3. Step 3: Cross multiply
    91,223.70x = 136,543.95 × 64,979.70
  4. Step 4: Simplify right side
    91,223.70x = 8,872,584,907.82
  5. Step 5: Solve for x
    x = 8,872,584,907.82/91,223.70
  6. Step 6: Final answer
    x = 97,261.84

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.